There are 3 different options that fit your request. Which time would you like to depart, 05:24, 06:24, or 07:24?
I need to depart whichever train gets me to Cambridge closest to 08:30 am.
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train-arriveby train-day train-departure train-destination
train-arriveby train-day train-departure train-destination
train-arriveby train-day train-departure train-destination